CN109252038A - Hypereutectoid steel rail web burning optimization on line method and its restraint device - Google Patents
Hypereutectoid steel rail web burning optimization on line method and its restraint device Download PDFInfo
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- CN109252038A CN109252038A CN201811376786.1A CN201811376786A CN109252038A CN 109252038 A CN109252038 A CN 109252038A CN 201811376786 A CN201811376786 A CN 201811376786A CN 109252038 A CN109252038 A CN 109252038A
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- rail
- web
- restraint device
- head
- cooling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Disclosed by the invention is a kind of hypereutectoid steel rail web burning optimization on line method and its restraint device of technical field of metal heat treatment, firstly, controlling rail temperature at 700-800 DEG C, and detects carbon mass percentage content in rail；Then, rail is sent into restraint device, rail head of rail tyre tread center, rail head two sides and rail bottom center is applied using restraint device and accelerate cooling medium；Finally, rail is sent out restraint device when rail temperature is reduced to 450-500 DEG C.The beneficial effects of the present invention are: stablizing rail using restraint device, then according to carbon content in rail come the acceleration cooling medium of rail head and rail bottom application different pressures to rail, reduce rapidly rail head and rail bottom temperature, the heat at web of the rail position is caused to conduct to both ends rapidly, to reduce steel rail web residual stress, inhibit high-carbon rail secondary cementite content, finally improves the comprehensive performance of rail weak part.
Description
Technical field
The present invention relates to technical field of metal heat treatment more particularly to a kind of hypereutectoid steel rail web burning optimization on line methods
And its restraint device.
Background technique
As railway gradually develops to shipping heavy duty and passenger traffic high-speed mode, heavy-haul line is to rail wear-resisting property and its excellent
More stringent requirements are proposed for good service performance.To adapt to heavy-haul line requirement, phosphorus content >=0.9% is developed in succession both at home and abroad
Hypereutectoid rail, which has higher intensity and toughness, but due to containing secondary cementite, need to complete heating cooling
Process inhibits the precipitation of net secondary cementite content.At present for the cooling of hypereutectoid rail also in researcher's
The stage that experience is operated, the operating procedure and specific Con trolling index of none specification cause hypereutectoid rail secondary
Cementite amount of precipitation is big, and web of the rail quality is irregular, and quality control is poor.
Summary of the invention
To overcome existing heat treatment process to control on inhibiting the precipitation of eutectoid steel steel rail web net secondary cementite content
The deficiencies of poor, the technical problems to be solved by the present invention are: provide it is a kind of can improve hypereutectoid rail comprehensive performance, inhibit rail
The burning optimization on line method and its restraint device that waist net secondary cementite content is precipitated.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of hypereutectoid steel rail web burning optimization on line method, comprising the following steps:
Firstly, controlling rail temperature at 700-800 DEG C, and detect carbon mass percentage content in rail；
Then, rail is sent into restraint device, using restraint device to rail head of rail tyre tread center, rail head two sides and rail bottom
Center, which applies, accelerates cooling medium；
Finally, rail is sent out restraint device when rail temperature is reduced to 450-500 DEG C；
The pressure that the cooling velocity of the cooling medium is sprayed between 1-5 DEG C/s, cooling medium are as follows: V=(T1-700)/70
+ C/0.95+G/20-2, cooling device arrangement length are S=(T1-700)+(C-0.9) * 10+ (G-15) * 6, wherein T1 is steel
Rail enters unit web of the rail temperature, and unit is DEG C that C is carbon mass percentage content in rail, and G is web of the rail thickness, unit mm.
Further, the cooling medium is to spray wind or spraying.
The restraint device of burning optimization on line, including fixed frame and cooling device are carried out to the railroad turnout steel rail web of the rail；The fixation
Top of the trellis is equipped with bottom restraint wheel, and the two sides of fixed frame are equipped with rocker arm, and the upper end of rocker arm is equipped with guide plate, and the inside of guide plate is equipped with upper
Constraint wheel, the rail bottom of the rail are placed on bottom restraint wheel, and the upper constraint wheel is against steel rail web two sides respectively；It is described
Cooling device is equipped with multiple nozzles, and nozzle is respectively toward to rail head of rail tyre tread center, rail head two sides and rail bottom center.
Further, the middle part of the rocker arm and fixed frame are hinged, the lower end of rocker arm is by adjusting bolt and fixed frame
It is connected.
Further, the path length of the arrangement of nozzles is S=(T1-700)+(C-0.9) * 10+ (G-15) * 6,
In, T1 is that rail enters unit web of the rail temperature, and unit is DEG C that C is carbon mass percentage content in rail, and G is web of the rail thickness, unit
For mm.
The beneficial effects of the present invention are: stablizing rail using restraint device, then according to carbon content in rail come to steel
The rail head and rail bottom of rail apply the acceleration cooling medium of different pressures, reduce rapidly rail head and rail bottom temperature, lead to web of the rail portion
The heat of position is conducted to both ends rapidly, to reduce steel rail web residual stress, inhibits high-carbon rail secondary cementite content, most
The comprehensive performance of rail weak part is improved eventually.
Detailed description of the invention
Fig. 1 is main view of the present invention.
Fig. 2 is side view of the present invention.
Marking in figure is 1- fixed frame, 2- cooling device, 3- bottom restraint wheel, 4- rocker arm, 5- guide plate, constrains wheel on 6-,
7- rail, 8- nozzle, 9- adjust bolt.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Hypereutectoid steel rail web burning optimization on line method provided by the present invention, comprising the following steps:
Firstly, controlling rail temperature at 700-800 DEG C, and detect carbon mass percentage content in rail；
Then, rail is sent into restraint device, using restraint device to rail head of rail tyre tread center, rail head two sides and rail bottom
Center, which applies, accelerates cooling medium；
Finally, rail is sent out restraint device when rail temperature is reduced to 450-500 DEG C；
The pressure that the cooling velocity of the cooling medium is sprayed between 1-5 DEG C/s, cooling medium are as follows: V=(T1-700)/70
+ C/0.95+G/20-2, cooling device arrangement length are S=(T1-700)+(C-0.9) * 10+ (G-15) * 6, wherein T1 is steel
Rail enters unit web of the rail temperature, and unit is DEG C that C is carbon mass percentage content in rail, and G is web of the rail thickness, unit mm.
The temperature and carbon content of rail determine the intensity and toughness of rail in heat treatment process, traditional type of cooling compared with
To be slow, easily there is carbon precipitation, rail residual stress is not easy the problems such as discharging, and it is insufficient also to have led to steel rail web performance.This
Invention by rail head of rail tyre tread center, rail head two sides and rail bottom center apply accelerate cooling medium, can make rail head of rail and
The temperature of rail bottom reduces rapidly, and the heat at web of the rail position is conducted to both ends rapidly, to reduce steel rail web residual stress.Together
When, different cooling rates can be applied according to the difference of carbon content in hypereutectoid rail, cooling rate mainly passes through cooling Jie
The pressure and cooling distance that matter sprays are realized.Above-mentioned formula is that applicant obtains by protracted experience and a large number of experiments summary,
Corresponding cooling control can be carried out to the rail of different phosphorus content, while improving steel rail web comprehensive performance, also favorably
In the quality control of final products.
In order to enable cooling medium uniformly and quickly to spray, cooling rapidly to achieve the purpose that, the cooling medium is best
For spray wind or by spraying.
The restraint device of burning optimization on line is carried out to hypereutectoid steel rail web, as shown in Figure 1 and Figure 2, including 1 He of fixed frame
Cooling device 2 is equipped with bottom restraint wheel 3 at the top of the fixed frame 1, and the two sides of fixed frame 1 are equipped with Rocker arm 4, and the upper end of Rocker arm 4 is set
Have a guide plate 5, the inside of guide plate 5 is equipped with upper constraint and takes turns 6, and the rail bottom of the rail 7 is placed on bottom restraint wheel 3, it is described it is upper about
Beam wheel 6 is against the web of the rail two sides of rail 7 respectively；The cooling device 2 is equipped with multiple nozzles 8, and nozzle 8 is respectively toward to rail 7
Rail head tyre tread center, rail head two sides and rail bottom center.
Bottom restraint wheel 3 is mainly used for carrying and conveying rail 7, in order to avoid bottom restraint wheel 3 blocks in the middle part of rail bottom, shadow
Cooling effect is rung, bottom restraint wheel 3 can be arranged in rail bottom two sides, reserves middle part for nozzle 8 to rail bottom spray cooling medium.
The upper constraint wheel 6 of two sides is for being clamped the web of the rail, to limit 7 double swerve of rail.The cooling device 2 includes cooling
With the component of pressurization, and the pressure of cooling medium ejection is controlled equipped with control system, it is different including applying to different position
Pressure.Cooling nozzle 8 is carried out for same position, can be spaced be uniformly arranged it is multiple, to improve cooling effect.
Since the thickness of the web of the rail in the middle part of the railroad turnout steel rail of different model is different, in order to make the present apparatus can adapt to difference
The web of the rail of thickness, the middle part of the Rocker arm 4 and fixed frame 1 is hinged, and the lower end of Rocker arm 4 is by adjusting bolt 9 and 1 phase of fixed frame
Even.Bolt 9 is adjusted by rotation, Rocker arm 4 can be made to rotate around the hinge joint at middle part, so that two Rocker arm 4 upper ends of control are realized
Folding, to achieve the purpose that the web of the rail of different-thickness can be clamped.
Further, the path length that the nozzle 8 is arranged is S=(T1-700)+(C-0.9) * 10+ (G-15) * 6,
In, the unit of S is mm, and T1 is that rail enters unit web of the rail temperature, and unit is DEG C that C is carbon mass percentage content in rail, and G is
Web of the rail thickness, unit mm, the cooling path that the path length i.e. rail that nozzle 8 is arranged are passed through, the distance can guarantee
While cooling effect, make the utilization of resources more economical rationality, to reach energy-saving and environment-friendly purpose.
The application is further illustrated below by comparative test.
Embodiment:
The embodiment of the present invention and corresponding comparative example select following rail chemical component.
1 embodiment rail chemical component of table/%
Comparative example in the present invention uses chemical component identical with embodiment, heating, rolling mill practice.Rail rail type substance
For 75kg/m, web of the rail thickness is 20mm, and it is 760 DEG C that rail, which enters unit temperature,.
1# to 4# is the restraint device (cooling velocity of cooling medium) using different process and is aided with different heat treatment work
Skill, 5# are that comparative example does not carry out heat treatment process.Then, 5 samples are produced using identical heating, rolling mill practice,
2 embodiment of table and comparative example heat-treatment of rail technique and the heat treatment restraint device of use
According to TB/T 2344-2012 requirement, respectively to 5 rail samples carry out tensile properties, secondary cementite content and
The detection of rail bottom residual stress, inspection result are as shown in table 3.
3 embodiment of table and the inspection of comparative example rail tensile property, secondary cementite, tissue and residual stress are examined
The rail that the present invention has chosen identical chemical component simultaneously compares, in embodiment, used 4 kinds of processing
Mode is the method in the present invention.The comparing result of table 1 to table 3 show by hypereutectoid rail using heat treatment process,
Its intensity and toughness improve.It is cooling to steel rail web constraint and certain heating using web of the rail spray wind and restraint device simultaneously,
Steel rail web secondary cementite content is substantially reduced.But 2 DEG C/s heating cooling, easily generation martensitic structure are applied to the web of the rail.
In conclusion the heat treatment production method of hypereutectoid rail and its heat treatment restraint device provide one in the present invention
While kind has for improving rail comprehensive performance, hypereutectoid steel rail web net secondary cementite content and residual stress are reduced
Effective ways, can be substantially reduced steel rail web residual stress, the matching of rail organization and performance be improved, to improve
Trouble steel rail web comprehensive performance, has good practicability and application prospect.
Claims (5)
1. hypereutectoid steel rail web burning optimization on line method, characterized in that the following steps are included:
Firstly, controlling rail temperature at 700-800 DEG C, and detect carbon mass percentage content in rail；
Then, rail is sent into restraint device, using restraint device to rail head of rail tyre tread center, rail head two sides and rail bottom center
Apply and accelerates cooling medium；
Finally, rail is sent out restraint device when rail temperature is reduced to 450-500 DEG C；
The pressure that the cooling velocity of the cooling medium is sprayed between 1-5 DEG C/s, cooling medium are as follows: V=(T1-700)/70+C/
0.95+G/20-2, cooling device arrangement length are S=(T1-700)+(C-0.9) * 10+ (G-15) * 6, wherein T1 enters for rail
Unit web of the rail temperature, unit be DEG C, C be rail in carbon mass percentage content, G be web of the rail thickness, unit mm.
2. hypereutectoid steel rail web burning optimization on line method as described in claim 1, it is characterized in that: the cooling medium is spray
Wind is spraying.
3. pair hypereutectoid steel rail web as described in claim 1 carries out the restraint device of burning optimization on line, it is characterized in that: including
Fixed frame (1) and cooling device (2)；Bottom restraint wheel (3) are equipped at the top of the fixed frame (1), the two sides of fixed frame (1) are equipped with
The upper end of rocker arm (4), rocker arm (4) is equipped with guide plate (5), and the inside of guide plate (5) is equipped with upper constraint wheel (6), the rail of the rail (7)
Bottom is placed on bottom restraint wheel (3), and the upper constraint wheel (6) is against rail (7) web of the rail two sides respectively；The cooling device
(2) multiple nozzles (8) are equipped with, nozzle (8) is respectively toward to rail head tyre tread center, rail head two sides and the rail bottom center of rail (7).
4. restraint device as claimed in claim 3 shakes it is characterized in that: the middle part of the rocker arm (4) and fixed frame (1) are hingedly
The lower end of arm (4) is connected by adjusting bolt (9) with fixed frame (1).
5. restraint device as described in claim 3 or 4, it is characterized in that: the path length of the nozzle (8) arrangement is S=
(T1-700)+(C-0.9) * 10+ (G-15) * 6, wherein T1 is that rail enters unit web of the rail temperature, and unit is DEG C that C is carbon in rail
Mass percentage content, G are web of the rail thickness, unit mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811376786.1A CN109252038B (en) | 2018-11-19 | 2018-11-19 | Online heat treatment method for hypereutectoid steel rail web and restraint device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811376786.1A CN109252038B (en) | 2018-11-19 | 2018-11-19 | Online heat treatment method for hypereutectoid steel rail web and restraint device thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109252038A true CN109252038A (en) | 2019-01-22 |
| CN109252038B CN109252038B (en) | 2020-11-10 |
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| CN201811376786.1A Active CN109252038B (en) | 2018-11-19 | 2018-11-19 | Online heat treatment method for hypereutectoid steel rail web and restraint device thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112280966A (en) * | 2020-10-21 | 2021-01-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for regulating and controlling microstructure of steel rail welding joint |
| CN112280965A (en) * | 2020-10-21 | 2021-01-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for inhibiting harmful microstructure of steel rail welding joint |
| CN112359195A (en) * | 2020-10-21 | 2021-02-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for optimizing steel rail welded joint microstructure |
| CN114152617A (en) * | 2021-10-14 | 2022-03-08 | 攀钢集团研究院有限公司 | Method for accurately measuring and reducing proportion and distribution of proeutectoid cementite |
| CN112301278B (en) * | 2020-10-12 | 2022-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloy hypereutectoid steel rail and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112301278B (en) * | 2020-10-12 | 2022-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloy hypereutectoid steel rail and preparation method thereof |
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| CN112280965A (en) * | 2020-10-21 | 2021-01-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for inhibiting harmful microstructure of steel rail welding joint |
| CN112359195A (en) * | 2020-10-21 | 2021-02-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for optimizing steel rail welded joint microstructure |
| CN114152617A (en) * | 2021-10-14 | 2022-03-08 | 攀钢集团研究院有限公司 | Method for accurately measuring and reducing proportion and distribution of proeutectoid cementite |
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